Outage yesterday (scheduled) fixed the random crashing issues. Ended up being a few things; including a corrupted innodb table. Fixed that, ran 24 hours without error and all good.

I'm now converting the database to a different format (still innodb but barracuda format), and the import is taking awhile. Just stumbled on a weird release note that shows an option required that isn't in the conversion guides, so whenever this is done -- if it needs it, not sure if I'm going to start over with the right option or just bring it back online. Depends on tired level.